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Policy Qualifiers in RPKI Certificates

The information below is for an old version of the document.
Document Type
This is an older version of an Internet-Draft that was ultimately published as RFC 7318.
Authors Andy Newton , Geoff Huston
Last updated 2014-06-03 (Latest revision 2013-10-02)
Replaces draft-newton-sidr-policy-qualifiers
RFC stream Internet Engineering Task Force (IETF)
Additional resources Mailing list discussion
Stream WG state Submitted to IESG for Publication
Document shepherd Sandra L. Murphy
Shepherd write-up Show Last changed 2014-05-27
IESG IESG state Became RFC 7318 (Proposed Standard)
Consensus boilerplate Yes
Telechat date (None)
Responsible AD Alia Atlas
Send notices to,
IANA IANA review state IANA OK - No Actions Needed
IANA action state No IANA Actions
RFC Editor RFC Editor state EDIT
Network Working Group                                          A. Newton
Internet-Draft                                                      ARIN
Updates: 6487 (if approved)                                    G. Huston
Intended status: Standards Track                                   APNIC
Expires: April 05, 2014                                 October 02, 2013

                 Policy Qualifiers in RPKI Certificates


   This document updates RFC 6487 by clarifying the inclusion of policy
   qualifiers in the certificate policies extension of RPKI resource

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 05, 2014.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   ( in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

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Table of Contents

   1.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Update to RFC 6487  . . . . . . . . . . . . . . . . . . . . .   2
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   3
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in [RFC2119].

2.  Update to RFC 6487

   [RFC6487] profiles certificates, certificate revocation lists, and
   certificate signing requests specified in [RFC5280] for use in
   routing public key infrastructure.

   [RFC5280] defines an extension to certificates for the listing of
   policy information (See section  [RFC6487] states in
   Section 4.8.9: "This extension MUST be present and MUST be marked
   critical.  It MUST include exactly one policy, as specified in the
   RPKI CP [RFC6484]".  This references the CertPolicyId of the sequence
   allowed in PolicyInformation as defined by [RFC5280].

   [RFC5280] also specifies that PolicyInformation may optionally have a
   sequence of PolicyQualifierInfo objects.  [RFC6487] does not
   specifically allow or disallow these PolicyQualifierInfo objects
   although it also states in section 4: "Unless specifically noted as
   being OPTIONAL, all the fields listed here MUST be present, and any
   other fields MUST NOT appear in a conforming resource certificate."

   This document updates [RFC6487], Section 4.8.9, as follows:


         This extension MUST be present and MUST be marked critical.  It
         MUST include exactly one policy, as specified in the RPKI CP


         This extension MUST be present and MUST be marked critical.  It
         MUST include exactly one policy, as specified in the RPKI CP

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         [RFC6484].  Exactly one policy qualifier MAY be included.  If a
         policy qualifier is included, the policyQualifierId MUST be the
         CPS pointer qualifier type (id-qt-cps).

   As noted in [RFC5280], section "Optional qualifiers, which
   MAY be present, are not expected to change the definition of the
   policy."  In this case any optional policy qualifiers that MAY be
   present in a resource certificate MUST NOT change the definition of
   the RPKI CP [RFC6484].

3.  IANA Considerations


4.  Security Considerations

   The Security Considerations of [RFC6487] apply to this document.

   This document updates the RPKI certificate profile to specify that
   the certificate policies extension can include a policy qualifier,
   which is a URI.  Checking of the URI might allow denial-of-service
   (DoS) attacks, where the target host may be subjected to bogus work
   resolving the URI.  However, this specification, like [RFC5280],
   places no processing requirements on the URI included in the

   As an update to [RFC6487], this document broadens the class of
   certificates that conform to the RPKI profile by explicitly including
   within the profile those certificates that contain a policy qualifier
   as described here.  A relying party that performs a strict validation
   based on [RFC6487] and fails to support the updates described in this
   document, would incorrectly invalidate RPKI objects that include the
   changes in Section 2.

5.  Acknowledgements

   Frank Hill and Adam Guyot helped define the scope of this issue and
   identified and worked with RPKI validator implementers to clarify the
   use of policy qualifiers in resource certificates.

   Sean Turner provided significant text to this document regarding the
   processing of the CPS URI and limiting the scope of the allowable
   content of the policy qualifier.

6.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

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   [RFC5280]  Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
              Housley, R., and W. Polk, "Internet X.509 Public Key
              Infrastructure Certificate and Certificate Revocation List
              (CRL) Profile", RFC 5280, May 2008.

   [RFC6484]  Kent, S., Kong, D., Seo, K., and R. Watro, "Certificate
              Policy (CP) for the Resource Public Key Infrastructure
              (RPKI)", BCP 173, RFC 6484, February 2012.

   [RFC6487]  Huston, G., Michaelson, G., and R. Loomans, "A Profile for
              X.509 PKIX Resource Certificates", RFC 6487, February

Authors' Addresses

   Andrew Lee Newton
   American Registry for Internet Numbers
   3635 Concorde Parkway
   Chantilly, VA  20151


   Geoff Huston
   Asia Pacific Network Information Center
   6 Cordelia Street
   South Brisbane  QLD 4101


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